/*
 * Copyright 2009-2010 by The Regents of the University of California
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * you may obtain a copy of the License from
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package edu.uci.ics.algebricks.compiler.algebra.properties;

import edu.uci.ics.hyracks.dataflow.std.file.FileSplit;

public class FileSplitDomain implements INodeDomain {

    private FileSplit[] splits;

    public FileSplitDomain(FileSplit[] splits) {
        this.splits = splits;
    }

    @Override
    public Integer cardinality() {
        return splits.length;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("FileSplitDomain[");
        boolean fst = true;
        for (FileSplit fs : splits) {
            if (fst) {
                fst = false;
            } else {
                sb.append(", ");
            }
            sb.append(fs.getNodeName() + ":" + fs.getLocalFile());
        }
        sb.append(']');
        return sb.toString();
    }

    @Override
    public boolean sameAs(INodeDomain domain) {
        if (!(domain instanceof FileSplitDomain)) {
            return false;
        }
        FileSplitDomain fsd = (FileSplitDomain) domain;
        if (fsd.splits.length != splits.length) {
            return false;
        }
        // conservative approach...
        for (int i = 0; i < splits.length; i++) {
            if (!ncEq(splits[i], fsd.splits[i])) {
                return false;
            }
        }

        return true;
    }

    private boolean ncEq(FileSplit fs1, FileSplit fs2) {
        return fs1.getNodeName().equals(fs2.getNodeName());
    }

}
